Firearm



@Ct 24, i944 J. DOBREMYSL gmag@ FREARM Filed Feb. 23, 1941 2Sheets-Sheetl INVENTOR. JOSEF DOBEMYSL.

Usi., 249 E944. J, DOBREMYSL FIREARM 2 Sheets-Sheet 2 Filed Feb. 2B,1941 F`IG.5.

INVENTOR. JOSEF DOBEMYSL.

Patented Oct.l 24, 1944 FIREARMY.

JosefDob'emysl,- Cambridge, England Application February 28, 1941;`,Serial-N0.3.8.1409?v In GreatfBritain Novemhenl'l, 1939.'

1 Claim.

This.; invention relates :to` fire arms.:

Oneobject of the'V inventionis; to provide-dore easy dismantlingw oi"gunszwithouti thenecessity: of placing damaged parts ontheground?andtor` operate. guns also inv prostrate; position of the:gunner.,

Another object of `.the invention is to provideA means ifor easy andquick. opening-1 oftheirear` part of the gunandtilting this partzoutvoftlie path` of' the breech mechanism-whenremovingA the latter fromthegun.

A' further object ofthe-'invention is `to provide meansior preventing`the rear part of Athe-gun tobetilted until it'has been drawn intoitsrearmost` position.

Anotherobject of the-invention isto providemeans renderingthe gun bodysturdy and-resisting to bending stresses-annifdeformations"in operationof the gun.

A stillfurtherobject of the invention is to provide improved means forelastically absorbing the shocks to which the gun or its parts aresubjected in operation or handling.

According to the invention the trigger housing with the shoulder pieceare made as vone unit which with its associated parts is arranged forlongitudinal sliding movement along the casing of the gun and afterreleasing a suitable locking device it can be drawn back and in itsretracted position tilted down and the shoulder piece set on the ground,so that in combination with the support or bipod it may be used tosupport the gun with the breech in the open position clear of theground. The breech mechaism which is slidably mounted, can then be drawnback so as to be freely accessible for inspection, adjustment orexchange of parts. When the cause of failure has been removed themechanism can be pushed forward to its normal position and the rear partof the fire arm, after being raised about its pivot, can be pushedforward and secured in position by the locking device.

Other objects, features and advantages will appear from the drawings andthe description hereinafter given.

One way of carrying out the invention is shown in the accompanyingdrawings, wherein Fig. l is a side view of the rear part of the gun inits normal position,

Fig. 2 is a side View, partly in section, showing how the gun' issupported for the purpose of removing the mechanism,

. Fig. 2a is a side View, partly in section, showing themec'hanism'aofzthe'fgun'removedtfrom lthe casingv oither Fig.3 representsa side View.vof a'part of the gung. adjacent' of the trigger housing; with: the

rea-r, -par.tipartly'v drawn ,back in" the directionfof.

the arrow A.

Fig. 4 is a similar view of the part ofthe'gun asi illustrated in Fig.:3 butl withy the. reary part swung-down.

Fig.z5 is a crosssection of .the-gunf-.taken'on the` line. 5-5wofFigi 3showing'a: detailoffthe .gun`

in its open position.v

Fig. dis across'sectiontaken' on the line 6`6 of; Fig; 7 -on ailargerscale illustrating the guide;

Fig.; 7 is a sectional pview offthe-.buier device drawings,;.V comprisesacasing`A I..` connected' withzthebarrell.. The breechmecham'sm may.

be of any design and in the present example a breech mechanism of thetilting breech block type is shown. It consists substantially of abreech block 3, breech block carrier 4 and recoil spring 5. These partsare'shown in Fig. 2 in their working position and in Fig. 2a in aretracted position removed from the gun casing. The gun may be arrangedfor any type of feeding and in the drawing feeding from a magazine 6 isshown. The operation of a breech mechanisrn of this kind is well knownand need not be described in detail.

A trigger mechanism 'I is arranged in a trigger housing 8. The triggermechanism itself may be of any design and does not form part of thepresent invention. A guide 9 for the recoil spring 5 is mounted in thetrigger housing. At

the rear end of the trigger housing 8 a shoulder piece I0 is secured,preferably by bolts or in any other Way. The shoulder piece forms thusone unit with the trigger housing. A longitudinal slot II is provided inthe trigger housing for the passage of a locking bolt I2 which serves tofasten the trigger housing in its operative position on the casing ofthe gun. The purpose of the longitudinal slot I'I will be explainedhereinafter.

Suitable guiding means are provided on the casing I of the gun and onthe trigger housing 8 for allowing longitudinal movement of the triggerhousing along the casing I. In a preferred embodiment of the invention aso called cross guide is used for this purpose. Fig. 4 shows a guide ofthis type in cross section. The wall of the casing I is provided at oneside with a rib I3 extending in the direction of the sliding movement.The other part of the guide on the trigger housing 8 is formed toembrace with its sections I4 and I5 both the wall of the casing I andits rib I3. In this way the gun casing is reinforced against bendingstresses and deformation of its side walls and any lateral movement oryielding of the rear part of the gun, especially during firing operationand handling is positively avoided.

A pivot I6 is arranged at the front end ofthe trigger housing 8 (seeFigs. 3 and 4).

I6 has iiattened parts I1 adapted for engagement with correspondingguiding slots I8 formed in the bearing 22 for the pivot I6. The bearingis connected or made integral with the casing I.

The rear part of the trigger housing 8 comprises a spring buffer I9 witha spring 20, see Fig, 5. When in operative position, the buffer abutsagainst projections 2| on the casing I. The buffer is further'shaped soas to co-act with the rear face of the breech block carrier 4.

The spring buffer servesthree purposes:

First, it absorbs the recoil shock of the of the barrel 2. The barrel 2is connected with the casing I so that the recoil shock of the barrel istransmitted to the casing I and by the intermediary of the projections2l to the buffer and spring 2D.

Second: being made to cooperate with the rear surface of the carrier 4the bufferA is capable to absorb that part of the recoil shock of thecarrier and the mechanism associated vwith it, which was not absorbed bythe recoil spring I5. i

Third: The buifer I and spring 20 allow th shoulder piece I0 to yieldupon -f an impact on the latter. In order to allowv this movementtheslot II for the locking bolt I2 is made longitudinal (Figs. 2 and 5).

To open the gun the locking member, such as the bolt I2, securing' thetrigger housing with its associated parts to the casing of the gun, is

The pivoty released and the trigger housing 8 with the shoulder pieceIQ, the trigger mechanism .1, the recoil spring 5, its guide 9 and thebuffer and spring arrangement I9, 28, may be drawn back until the pivotI6 passes thev slot I8 and enters its bearing, and then turneddownwardly around the pivot I6 and the shoulder piece ID set'on theground. The gun supported at its iront end by a support or bipod 22rests now at its rear end on the shoulder piece as an additional supportor leg. The breech*A mechanism .can be then drawn back, as shown in Fig.2a. 'Ihe fire arm is assembled in reverse sequence of operations.

unit with said trigger housing to serve as a second support, guidingmeans in said ring casing and on said trigger housing permitting limitedlongitudinal movement for securing the trigger housingv in position onsaid casing, a pivot pin in the trigger housing on which the rear partof the fire arm is swung, a bearing for said pivot pin arranged on saidiring casing, guides for the pivot pin in said bearings, said pivot pinhavingv flattened parts adapted for engagement With said guides on saidbearing in the last stage of the backward movement of the rear part ofthe fire arm and guiding it after it has come out of engagement with theguiding means in the casing of the nre arm.

JOSEF DOBREMYSL.

